Valve and valve rod construction



March 22, 1932. AVENG LAND 1,850,619

VALVE AND VALVE ROD CONSTRUCTION Filed Feb.

INVENTOR ALEXANDER ENGLAND w BY W ATTORNEY Patented Mar. 22,1932? PATENT" OFFICE I I ALEXANDER ,ENGLANRVOF WILKINSBURG, PENNSYLVANIA, AssIGuoa TO "THE wnsrT V inenoosnnrn BRAKE iCOMPANY, or WILMERDING, PENNSYLVANIA, A oo PoR-ni 'TION OF PENNSYLVANIA vALvE nn vALvE non consr'nucirion Application fil'ed Fepruary 5, 1929. Serial No. 337,566.

V This invention relates to a valve and valve rod construction, and more particularly of the reversing valve type, such as employed on l locomotive steam driven fluid compressors.

In a compressor of the above type, a main valve is provided for controlling the admis-- sionand exhaust ofsteam to and from the steam cylinder of the compressor and said valve is operated by differential pistons. The 1i) movement of the pistons is controlled by a reversing valve, which in turn is operated by a reversing rod, the reversing rod being operated by the movement of the compressor pistons.

The reversing valve is a slide valve and is provided with wings which extendon oppo-,

site sides of the reversing rod, bet-ween collars carried by the rod. In order to strengthen the rod against breakage, fillets are provided where the collars join the rod, and in order to prevent assembling the valve on the rod in the wrong way, one fillet is made larger than the other, and the valve is provided with corresponding chamfers. r

t has been found that the smaller fillet is not sufficient to prevent possible breakage of the reversingrod at this point, and the principal object of my invention is to provide a valve and valve rod constructionin which both fillets are amply large to prevent possible breakage without making one of'the fil- 1 1 d at th same time j lets 'eicesslve y arge' an e reversing rod, a fillet 15 is provided, and this .fil let is made largerthan heretofore but the valve cannot be assembled on the rod in the wrong way. I

In the accompanying drawings; Fig. 1 1s a sectional view of a portion of a steam driven M fiuid compressor showing the improved valve and valve rod construction applied thereto; 0 Fig. 2 an enlarged view of a portion of the reversing rod with the reversing valve, in section, applied thereto; Fig. 3 an isometric view of a portion of the reversing valve; Fig. 41 a section on the line 4-4 of Fig. 2; Fig. 5 an enlarged view of a portion of thereversing valve and rod; and Fig. 6 is a partial view of the valve and the reversing rod.

A portion of a fluid compressor is shown in Fig. 1 comprising a'steam cylinder 1 containing'piston 2, which is connected by piston the chamfer 17 is more acute than the angle .stemp3 to an 'air compressing piston (not shown) in the usual manner.

The supply and exhaust of steam to and from opposite sides of piston 2 is controlled by a main slide valve 4: and said valveis operable by difierential pistons 5 and 6, which are connected together bya stem 7.

. Aflreversing valve 8 controls the admission and exhaust of steam to and from the pistons Sand 6, for effecting the movement of said pistons and the'slide valve 1, and the revers versing rod-9.

ing valve 8 is adapted to be operated by a rethe slot formed by the wings 10 is provided at its edge with a chamfer '14:, which is deep enough to provide a certain amount of clearance with respect to the fillet 13, when the valve and the rod are assembledin the compressor. i

At the juncture of the collar 12 with the smaller than the fillet 13 and preferably curved. The adjacent end of the half round bor'eis provided with a chamfer 16 to accommodate the fillet 15, but this 'chamfer does not extend up the straight sides of the valve wings, as is thecase with the chamfer 14 at the opposite end of the valve.

From the half roundchamfer 16,'a straight chamfer 17 extends outwardly along the edges of the valve wings 10., The angle of of the chamferlfi, so that the edges formed by the chamfers 17 overhang the chamfer 16,

asshown in Fig. 5- The dot and dash line A in Fig. '5 repre- 'sents the line of t-her fillet 13, from which it will be clear that the end of the valve having the fillet 13 cannot be assembled on the reversing rod where the chamfer 17 is located, since said chamfer will prevent fillet 13 from entering between the wings 10. I

By the above means, a relatively large fillet is provided at 15, where heretofore a small fillet was employed, and at the same time the construction is such that the fillet 13 at the other end of the rod cannot enter the chamfers provided at the other end of the rod for the fillet 15, thus preventing improper as-. senibling of the valve on the rod.

The clearance between the fillet 15 and the chamfer 17 is rather close and it is necessary to provide the chamfer 16 having a more abrupt angle, and consequently a greater clearance, so that when the valve and the rod are assembled in the compressor, the rod will have sufficient clearance laterally with respect to the valve, to ensure centering of the rod without binding on the valve in any way.

While one illustrative embodiment of the invention has been described in detail, it is not my intention to limit its scope to that embodiment or otherwise than by the terms of the appended claims.

Having now described my invention, what I claim as new and desireto secure by Letters Patent, is

- 1. In a valve and rod construction, a valve having wings forming a slot, a rod engaging in said slot and having collars between which the wings of the valve are disposed, a fillet at the juncture of each collar with the rod, one of which is larger than the other, a half roundchamfer at each end of the slot to receive the corresponding fillet, and chamfers extending from the half round chamfer at one end, and forming with a common plane a more acute angle than the half round chamfer in which acute angledchamfers the larger fillet will not enterl 2. Ina valve and rod construction, a valve having wings forming a 'slot with a half round base, a chamfer being formed atrthe juncture of the end face of the valve and wings, a rod engaging in said slot and having collars between which the valve is asr sembled, a fillet at the juncture of each, 001- lariwith the rod for which said chamfers provide clearance, one fillet being larger than the other, the chain'fer at one end of the valve having the half round portion at one angle and the straight portions ata more acute angle with a common plane such that the larger fillet will not enter. r

3. In a valve and rod construction, a valve having wings forming a slot having a U section, a rod engaging in said slot and having collars between which the valve is assembled, a fillet at the juncture of each collar with the rod, one fillet being larger than the other, a chamfer formed at the juncture of the slot walls with the end walls of the valve and I wings, the chamfer at one end having the straight portions of the U section at a more acute angle with a common plane than the remaining portion to prevent the entrance of the larger fillet.

, 4. In a valve and rod construction, a valve having wings forming a slot having a U section, a rod engaging in said slot and having collars between which the wings of the valve 1 are disposed, a fillet at the juncture of each I no 

